F-F-351 Filters And Filter Elements, Fluid Pressure: Lubricating Oil, Bypass And Full FlowThis specification covers oil filters and oil filter elements of bypass design; and also oil filter elements of the outside-to-inside flow-path of full-flow design for installation on internal combustion engines to remove contaminants from lubricating oil \(see 6.1\).

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F-F-351F

3.3 Materials. The offeror/contractor is encouraged to use recovered materials to the

maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition

Regulation (FAR) (see 6.4.7).

3.4 Design and construction. Filters and/or filter elements shall be the manufacturer's

current standard product which meets or exceeds the requirements specified herein.

3.4.1 Type I.

3.4.1.1 Filter body. Filter bodies shall be designed to withstand all the structural loads

imposed by the requirements of this specification. In addition, the filter housings and mountings

shall be of such strength and rigidity as to withstand the torque loads required for making tube

connections and the replacing of filter elements. Unless otherwise specified (see 6.2), exterior

surfaces of body shall be given the manufacturer's standard commercial finish.

3.4.1.1.1 Class 1, Style B. Filter shall consist of a body enclosing a filter element. The

body shall be equipped with necessary fastening and mounting arrangements and product markings

as specified and as required for satisfactory service in the intended application (see 6.2). Exterior

surfaces shall conform to 3.4.1.1.

3.4.1.1.2 Class 3. Design and general arrangement shall conform to F-F-351/2.

All screw threads shall be in accordance with FED-STD-H28/2. The structural strength of the

body shall be sufficient to operate safely with a tightening torque of 25 foot-pounds (ft-lb)

(33.9 newton⋅meters (N⋅m)) (see 4.6.1).

3.4.1.2 Cover assemblies.

3.4.1.2.1 Class 3.

3.4.1.2.1.1 Cover. Dimensions shall conform to F-F-351/2. The cover shall be

constructed of steel, 0.125 inch (in.) minimum thickness, or of material with equivalent

characteristics, suitable to withstand a tightening torque of 25 ft-lb applied to cover screw. The

cover shall be constructed to provide sufficient internal space for the element hold down spring

and sufficient external area for the cover screw gasket. Unless otherwise specified (see 6.2),

exterior surfaces of the cover shall be given the manufacturer's standard commercial finish.

3.4.1.2.1.2 Cover screw. When in place on cover, cover screw shall carry a spring, so

attached that it may be removed from screw when desired. Screw threads shall be in accordance

with FED-STD-H28/2.